单项选择题

Niagara Falls embodied national qualities in that ______.

A．it was symbol of the New World from Hennepin's time
B．its great size and vitality showed the unique features of America
C．some people patriotically described it
D．Both A and B

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单项选择题

What does the author imply by saying living space.., is figured ... also in cubic volume above the earth ( Lines 7- 8, Para. 3)

A．Our living space on the earth is getting smaller and smaller.
B．Our living space should be measured in cubic volume.
C．We need to take some measures to protect space.
D．We must preserve good living conditions for both birds and animals.

单项选择题

The author's attitude towards the current situation in the exploitation of natural resources is ______.

A．positive
B．suspicious
C．neutral
D．critical